Opposed anvil cell, material

The opposed anvil cell consists of two optical anvils and a gasket, located between the parallel faces of the two opposing anvils. Samples are placed in the hole of the gasket and are pressurized when the opposed anvils are pushed towards each other. The most common material for anvils is diamond. For mid and far infrared spectra, type Ila diamonds are used, while low-fluorescent type la diamonds are used for Raman spectroscopic measurements [5]. We have also devised a glass anvil cell for Raman spectroscopic measurements [6], and a calcium fluoride anvil cell for infrared spectroscopic measurements [7] with attainable working pressures of 13 and 6 kbar, respectively. Diagrams, for the interested reader, of the window and opposed anvil cells can be found in reference 1. 

In the Bridgman anvil device the sample is compressed between supported anvils of tungsten carbide, and lateral containment is ensured by a gasket that can be made of pyrophyllite or metallic material. A variety of cells based on the Bridgman opposed anvils has been developed [38 0]. Pressures up to 20GPa... 

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